chore(*): readme badges

resolves #258

Author: almostSouji

README.md

@@ -6,6 +6,7 @@
   <br />
   <p>
     <a href="https://discord.gg/djs"><img src="https://img.shields.io/discord/222078108977594368?color=5865F2&logo=discord&logoColor=white" alt="Discord server" /></a>
+    <a href="https://opencollective.com/discordjs"><img src="https://img.shields.io/opencollective/backers/discordjs?maxAge=3600&logo=opencollective" alt="backers" /></a>
   </p>
 </div>